But as I pressure cleaned them, the original paint on the walls, the gutters
and fascia boards are still there, there are spots that were removed by the
pressure cleaning but that is less than 5%. Therefore the primer will be
applied not over the raw materials - stucco, wood, alumnimum, but over the
existing paint which is arcylic. Following that logic, I would say it makes
no sense to use a wood primer to paint on a fascia board that is covered by
more than 95% existing paint, hence I need a primer for existing paint
surface, right? or am I overanalyzing?

Thanks in advance,

MC

A primer should be a good solution, even in this case.

Good luck